(BLOOMBERG) — The United Nations’ Food and Agriculture Organization called a special meeting of policy makers to discuss the global cereal markets as Russia extended a grain-export ban, stoking concern there may be wheat shortages.

“The purpose of holding this meeting is for exporting and importing countries to engage in constructive discussions on appropriate reactions to the current market situation,” the agency said in a statement on its website. The session will be held in Rome on Sept. 24.